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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - FAIR VALUE OF DERIVATIVES (Details) - CAD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value of Derivatives |  |
Total net derivative asset/(liability) | $ (2,283) | $ (2,192)
Foreign exchange contracts |  |
Fair Value of Derivatives |  |
Total net derivative asset/(liability) | (1,697) | (1,383)
Interest rate contracts |  |
Fair Value of Derivatives |  |
Total net derivative asset/(liability) | (156) | (348)
Commodity contracts |  |
Fair Value of Derivatives |  |
Total net derivative asset/(liability) | (414) | (457)
Other contracts |  |
Fair Value of Derivatives |  |
Total net derivative asset/(liability) | (16) | (4)
Recurring basis |  |
Fair Value of Derivatives |  |
Current derivative assets | 236 | 296
Long-term derivative assets | 115 | 181
Current derivative liabilities | (1,034) | (1,130)
Long-term derivative liabilities | (1,600) | (1,539)
Total net derivative asset/(liability) | (2,283) | (2,192)
Recurring basis | Foreign exchange contracts |  |
Fair Value of Derivatives |  |
Current derivative assets | 67 | 143
Long-term derivative assets | 43 | 145
Current derivative liabilities | (376) | (359)
Long-term derivative liabilities | (1,431) | (1,312)
Total net derivative asset/(liability) | (1,697) | (1,383)
Recurring basis | Interest rate contracts |  |
Fair Value of Derivatives |  |
Current derivative assets | 49 | 8
Long-term derivative assets | 42 | 13
Current derivative liabilities | (238) | (329)
Long-term derivative liabilities | (9) | (40)
Total net derivative asset/(liability) | (156) | (348)
Recurring basis | Commodity contracts |  |
Fair Value of Derivatives |  |
Current derivative assets | 120 | 145
Long-term derivative assets | 30 | 23
Current derivative liabilities | (411) | (439)
Long-term derivative liabilities | (153) | (186)
Total net derivative asset/(liability) | (414) | (457)
Recurring basis | Other contracts |  |
Fair Value of Derivatives |  |
Long-term derivative assets | 0 |
Current derivative liabilities | (9) | (3)
Long-term derivative liabilities | (7) | (1)
Total net derivative asset/(liability) | (16) | (4)
Level 1 | Recurring basis |  |
Fair Value of Derivatives |  |
Current derivative assets | 1 | 1
Current derivative liabilities | (11) | (13)
Total net derivative asset/(liability) | (10) | (12)
Level 1 | Recurring basis | Commodity contracts |  |
Fair Value of Derivatives |  |
Current derivative assets | 1 | 1
Current derivative liabilities | (11) | (13)
Total net derivative asset/(liability) | (10) | (12)
Level 2 | Recurring basis |  |
Fair Value of Derivatives |  |
Current derivative assets | 125 | 181
Long-term derivative assets | 90 | 160
Current derivative liabilities | (660) | (778)
Long-term derivative liabilities | (1,458) | (1,356)
Total net derivative asset/(liability) | (1,903) | (1,793)
Level 2 | Recurring basis | Foreign exchange contracts |  |
Fair Value of Derivatives |  |
Current derivative assets | 67 | 143
Long-term derivative assets | 43 | 145
Current derivative liabilities | (376) | (359)
Long-term derivative liabilities | (1,431) | (1,312)
Total net derivative asset/(liability) | (1,697) | (1,383)
Level 2 | Recurring basis | Interest rate contracts |  |
Fair Value of Derivatives |  |
Current derivative assets | 49 | 8
Long-term derivative assets | 42 | 13
Current derivative liabilities | (238) | (329)
Long-term derivative liabilities | (9) | (40)
Total net derivative asset/(liability) | (156) | (348)
Level 2 | Recurring basis | Commodity contracts |  |
Fair Value of Derivatives |  |
Current derivative assets | 9 | 30
Long-term derivative assets | 5 | 2
Current derivative liabilities | (37) | (87)
Long-term derivative liabilities | (11) | (3)
Total net derivative asset/(liability) | (34) | (58)
Level 2 | Recurring basis | Other contracts |  |
Fair Value of Derivatives |  |
Long-term derivative assets | 0 |
Current derivative liabilities | (9) | (3)
Long-term derivative liabilities | (7) | (1)
Total net derivative asset/(liability) | (16) | (4)
Level 3 | Recurring basis |  |
Fair Value of Derivatives |  |
Current derivative assets | 110 | 114
Long-term derivative assets | 25 | 21
Current derivative liabilities | (363) | (339)
Long-term derivative liabilities | (142) | (183)
Total net derivative asset/(liability) | (370) | (387)
Level 3 | Recurring basis | Commodity contracts |  |
Fair Value of Derivatives |  |
Current derivative assets | 110 | 114
Long-term derivative assets | 25 | 21
Current derivative liabilities | (363) | (339)
Long-term derivative liabilities | (142) | (183)
Total net derivative asset/(liability) | $ (370) | $ (387)

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